emailaddress "alcione.mora@uam.es"
EstimatedTime "8.5h"
GeneralDescription
******************
"This a mosaic imaging run in filters J, H and Ks. The goal is to
obtain deep 11.4'x11.4' 3x3 quadrants images, with the largest depth
in the central part of the mosaic and the signal to noise decreasing
as we move to the corners.
The inner part of the target object (NGC 602) fits in a single
quadrant of HAWK-I. The total science integration time available for
each filter (J: 0.8h, H: 3.1h, Ks: 3.1h) will be splitted into five
AutoJitter sequences (J: 5x0.16h, H: 5x0.62h, Ks: 5x0.62h). Each
AutoJitter will be performed with the telescope pointing to a
different offset position, in order to construct a mosaic. One
AutoJitter sequence will have the object centered in the middle of the
detector (i.e. in the center of the gap between the four quadrants),
while each of the other four sequences will have the object centered
in the middle of a different quadrant. One attached finding chart
(mosaic.jpg) shows the arrangement proposed.
The AutoJitter box width proposed is 30\" (two times the detector gap
of 15\"), a full 3x3 quadrants 11.4'x11.4' image with no gaps can be
reconstructed. The effective exposure time will be maximum in the
central part of the image (where the core of NGC 602 should be) and
will be progresively decrease as we move to the borders and corners of
the image.
Object coordinates (revised data):
NGC 602 RA 1:29:25.61 DEC -73:33:38.5 J2000
Position angle: 0 deg
Templates:
Acquisition: HAWKI_img_acq_Preset.tsf
Science: HAWKI_img_obs_AutoJitter.tsf, 30\" jitter box
Std stars: HAWKI_cal_StandardStar.tsf (If needed)
Observing blocks: We suggest that the five J AutoJitter sequences
(5x0.16h) could be performed in the same observing block. We suggest
that each of the five AutoJitter sequences for H and Ks (5x0.62h for
filter) has its own observing block.
Sky subtraction: The sky will be estimated with the AutoJitter
filtering of the observed field, using the zones more distant from the
nebulosity of the NGC 602 cluster.
Standard stars: Even though time was requested in the proposal for the
observation of standard stars, the new version of the HAWK-I manual
says that the instrument calibration plan will provide photometric
zero points for each observing night to the astronomers. If that is
the case, no dedicated standard star observations are needed in this
programme. If not (i.e., no zero points will be provided for free), we
have selected the following two stars from the HAWK-I list of standars
(those closer in RA to NGC 602):
O RA (J2000) Dec K sem N J-H sem N H-K sem N
FS 3 01 04 21.63 +04 13 36.0 12.823 (0.003) [ 7] -0.111 (0.003) [ 7] -0.089 (0.005) [ 8]
FS 5 01 54 34.65 -06 46 00.4 12.339 (0.005) [ 8] 0.004 (0.002) [ 7] -0.005 (0.002) [ 8]
Saturation and DITs: The brightest star in the whole 11.3'x11.3'
mosaic is 2MASS 01301659-7335056
RA 01 30 16.60 DEC -73 35 05.7
J= 10.945 H= 10.170 Ks= 9.991
Using the HAWK-I ETC we obtain that the maximum DITs that avoid
saturation of this star are: J~1s, H~0.5s and Ks~1s However, we are
interested in going as deep as possible, so we propose using DITs that
give background limited images, if observing a small amount (~15) of
moderately saturated objects is acceptable by HAWK-I and does not
generate problems such as persistence or memory of the detector. In
any case, Objects fainter than J=13, H=12.5 and Ks=12 should not be
saturated.
Finding charts: Four finding charts are included, showing the target
object as observed by DSS2-IR (I filter?) and 2MASS J, H and Ks. The
2MASS charts are 7.8'x10' in size, because the 2MASS server does not
provide broader images to comply with the 10'x10' request in the
HAWK-I manual. The DSS2-IR chart is 10'x10' in size (as requested) and
is not aligned with the N-E axes, because the ESO DSS2-IR server
provides tilted images. A circle shows the inner part of NGC 602 in
each chart.
In addition, a larger 15'x15' finding chart (mosaic.jpg) is
provided. It shows the five field positions requested for the mosaic
formation. Each of the five coloured boxes shows the full field of
view of HAWK-I in one offset position. The underlying image is from
DSS2-IR." #Enter Text Not greater than 8000 (characters)
WaiverRequest "No Waiver Request was submitted" #Enter Text Not
greater than 800 (characters)
CriticalObservingConstraint
***************************
"Seeing: It is the most important constraint and should be as low
as possible. The Phase I requirement is 0.8\" in Ks. It assumes a
seeing in V of 0.75\" and an airmass of 1.8. If the J and H images are
taken at higher elevation (see airmass constraints below), the seeing
requirements are:
J: < 0.85\"
H: < 0.80\"
Ks: < 0.80\"
Airmass: The airmass should not be greater than 1.8. However, as the
object culmination height is low (42 deg above the horizon), the
seeing requirements in J and H could be better fullfilled if they are
observed at airmasses below 1.6.
Sky transparency:
Photometric
Moon:
No significative influence in HAWK-I" #
TimeCriticalAspects "No time-critical aspects"
SpecialExecutionRequirements ""
SpecialCalibrationInfo ""
TooInformation ""
TooActivatorsList ""
IsPreImaging "false"
PreImagingRequirements ""
SourcePreimaging ""
PreImageOptions ""
AllOBsComply "YES" #
IsPreimagingRunQuestion "N/A" #
AllFCsComply "YES" #
IfStandardStar "YES" #
includeCalib "N/A" #
IfMovingTarget "N/A" #
UserPriority "N/A" #
IfCoordinatedObservations "N/A" #
IfStandardStarTpl "YES" #
IfSpecOffset "N/A" #
IfDrawSlit "N/A" #
IfBrightestStar "YES" #
IfMoveToPixel "N/A" #